In Johns version of the resurrection, Jesus always shows his hands and feet to his disciples. The wounds on his hands and feet show that Jesus died, and has risen again.
However, I believe that there is a deeper meaning to all these actions. In the Old testament, we often encounter the phrase "hand of God". This phrase means power of God. Thus when Jesus tells his disciples to look at his hands, he is telling them to see the power of God at work in his death and resurrection.
What about the feet? In Genesis, God told the serpent,
"I will put enmity between you and the woman. His feet shall crush your head and you will strike his heel."
At the resurrection, we see this prophecy fulfilled-Jesus has crushed the head of the serpent-and the wounds on his feet proved that the serpent has struck his heel. This proves the faithfulness of God in fulfilling his word as well as his victory over evil.
The resurrection therefore shows Gods power, faithfulness and sure victory over evil. We are a resurrection people and with this, we too have the power over evil. We have won over evil and evil cannot touch us because our Lord and Master has won the victory for us. No matter how dark things look-no matter how bad things go, we are sure of this, the Lords power is always with us. His faithfulness guarantees this. And in the end, we too will rise over our difficulties and win over evil by the power and faithfulness of our Lord.